If you use the editor only in HTML mode (or click save while in HTML mode) and insert tags with uppercase letters, they are not correctly transformed to lower case resulting in invalid Xhtml - it is now allowed to have tags with uppercase letters in Xhtml standard.

You can test this on the live site:
Go to: http://cutesoft.net/example/xmloutput.aspx click HTML tab and edit the first image open tag to be upper case. Click submit. Bam the tag is in upper case. Note that the property ConvertHTMLTagstoLowercase is not set to false and the default is true.

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http://blogs.vizibility.net/sdobrev

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asp.net Chat http://cutesoft.net/ASP.NET+Chat/default.aspx
Web Messenger: http://cutesoft.net/Web-Messenger/default.aspx
asp.net wysiwyg editor: http://cutesoft.net/ASP.NET+WYSIWYG+Editor/default.aspx
asp wysiwyg html editor: http://cutesoft.net/ASP
asp.net Image Gallery: http://cutesoft.net/ASP.NET+Image+Gallery/default.aspx
Live Support: http://cutesoft.net/live-support/default.aspx

Is this update going to be released soon or we have to wait for v5.3

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http://blogs.vizibility.net/sdobrev

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asp.net Chat http://cutesoft.net/ASP.NET+Chat/default.aspx
Web Messenger: http://cutesoft.net/Web-Messenger/default.aspx
asp.net wysiwyg editor: http://cutesoft.net/ASP.NET+WYSIWYG+Editor/default.aspx
asp wysiwyg html editor: http://cutesoft.net/ASP
asp.net Image Gallery: http://cutesoft.net/ASP.NET+Image+Gallery/default.aspx
Live Support: http://cutesoft.net/live-support/default.aspx